Anyone know how much Boost pressure you can take the standard nissan Turbochargers up to???

Very Very high but they will explode with a chance of killing you ;)

 

 

I hear they can do 17psi but that is starting to push it.

 

 

Stuart

mine are running 7hg approx going by the jap gauge which i would imagine is about 14psi....

i am using boost calibration jets about 1mm....i would like to go higher in pressure any idea's other than a boost controller?

Different boost jets with a smaller hole in them

May I also say that upping the boost is not really advised. I presume you have an ECU upgrade, but are the intercoolers stock?

 

If so they really need to be upgraded if you want higher boost than 14psi.

 

 

Stuart

no there not stock ....some things were removed by the importer for some strange reason but not the not so accessablw items...:p

was thinking about o.6mm ...? just wondered what pressure they would give?...any one use them?

Mine hits a good 7hg, aren't they meant to be 9psi standard? As far as I know it's had the exhaust & induction kit & that's all, does this sound right?:confused:

no mine before i put boost c jets in was about 5hgs which is where they normally run stock...

Don't quote me on this but I'm sure that a 0.6 mm B/J in only one side will give you around 11-12PSi. A 1mm B/Js on each side would give you around 13-14PSi. 2 0.6mm B/Js are going to give you atleast 17PSi. Not sure if that is a good idea!

 

I would only do that if I know I was going to be having new turbos, or I wasn't bothered about the bloke going bang.

 

I think Macca and ChrisC have increased theirs to 17PSi before now and to quote ChrisC, he said that it got a bit scarey at one point. That is via a Boost controller mind.

powermaster,

 

I run 0.6 jets and I only get 14psi , when I had 0.8 jets I could only get 12psi , I think this is probably due to a boost leak somewhere but I can not manage to find it

just out of intrest, what overall diameter are these boost jets/welding tips. im thinking of some 1mm but dont know what fatness to get.

I put 0.6mm boost jets in 'just to see the result'...

 

Considering I only have a stock boost gauge I couldn't tell you what I was boosting at but I would say the car was a tad scarry, on WOT the change from 1st to 2nd (mine's an Auto with ALC) almost snatched the wheel out of my hands, odd really as it's what I might have expected from Torque steer and FWD.

 

I'm running 1.5mm at the mo and it's a significant increase in boost over standard.

 

I'm just awaiting the purchase of an accurate boost gauge before I play any more. :D

 

Just remember if you go the welding tip route, it's the boost spikes that'll really screw you, as these are not controlled.

 

Tim

Originally posted by Cos

Don't quote me on this but I'm sure that a 0.6 mm B/J in only one side will give you around 11-12PSi. A 1mm B/Js on each side would give you around 13-14PSi. 2 0.6mm B/Js are going to give you atleast 17PSi. Not sure if that is a good idea!

 

I would only do that if I know I was going to be having new turbos, or I wasn't bothered about the bloke going bang.

 

I think Macca and ChrisC have increased theirs to 17PSi before now and to quote ChrisC, he said that it got a bit scarey at one point. That is via a Boost controller mind.

 

Is anyone else on this site running at 17psi or more with standard turbos..:confused:

I used to run 1.25 bar (18psi)on standard turbos for dragging, but for normal driving I stuck to 1.1 bar (just under 16 psi).

This was with standard interccoolers, but used Apex'i S-AFC &AVC-R to control fueling and boost. I would think that at 17psi you would get lots of detonation unless you've upped your fuelling....

 

HTH

AdamR

i have a remaped performance chip with no dett at 7hg's apprx 14psi....so 17-18 psi should be o.k. ????:confused:

Hi,

 

You can get over 18psi (1.25bar) on the stock turbos . With bigger intrcoolers, injectors, exhaust, ecu, 98+ octane. If you do plenty of hard driving rather than the odd blast, I'd say it's too much though!

 

I'm sure it could go to 19+psi with bigger downpipes... Any more and it will probably get detonation, especially in this hot weather.

 

But without a new ecu 12.5 is plenty, with an ecu 14.5 max.

 

Anything over 15 means you could run out of fuel at high revs and break something, this needs bigger injectors.

I'm sure I read on TT net that there's no point taking the stock blowers past 17psi as they become very inefficient.

Any gain you get in air density from the higher pressure is offset by the fact it's heated up more.

Might be worth doing a search on there and see what you can turn up on the subject.

FWIW, the stock injectors are at >97% duty cycle on the JWT map at ~13psi which is where their map runs off the load scale, so as you boost more the mixture will get leaner.

Never found it a problem at 15.5psi, even with the AFR lowered to 11.2 from 10.1 that JWT use.

Did you use a certain size boost jets for 15.5???or a boost controller?:confused:

Stock blowers take around 18 psi then generate more heat than they generate power.

 

ive had 25psi on hks gt2530's and they worked a treat lol.

Originally posted by 300z

Stock blowers take around 18 psi then generate more heat than they generate power.

 

ive had 25psi on hks gt2530's and they worked a treat lol.

 

You've had 25psi but what are you running now and how much did the gt2530's set you back initially...........;)

Originally posted by 300z

ive had 25psi on hks gt2530's and they worked a treat lol.

 

And you got beaten buy a few things on the way home from leman??? Bloody 'ell.

 

Or have u down graded a bit since then?

it would be nice to know if he is running lower psi or maybe higher???:confused:

Originally posted by powermaster71

it would be nice to know if he is running lower psi or maybe higher???:confused:

 

He is now running lower,he just told me on MSN,he did get it around the 20 though;)

25psi must be staggering amounts of power (is that when you had one of your rebuilds?!) LOL

 

My Z on a good day (cold dry weather/optimax fuel etc) would easy run round at 17psi without detonation and that was before I fitted the big intercoolers.

 

I think I took it up to 19 at one point for a short run in a moment of madness but I started having overheating problems shortly after that i could never trace and supected a head/gasket problem :(

 

The difference between 14 and 17psi is truly amazing but you must chip the ECU or use a fuel controller and above all listen out for detonation and back off you are in any doubt.

 

I hear some of the boost controllers can compensate for atmospheric pressure but most don't so one day you can run at 17 the next you might not be able to get much more than 14 without detonation so you need to be aware.

 

Does anyone know of a way to make a controller compensate for this? It must be possible without too much work I think.

 

Chris.